The Venous Excess Ultrasound Grading System in the Management of Hospitalized Patients with Hyponatremia: A Diagnostic Study. Portuguese Kidney Journal, [S. l.], 2025. DOI: 10.71749/pkj.118. Disponível em: https://pkj.spnefro.pt/index.php/journal/article/view/118.. Acesso em: 22 nov. 2025.